18 Rhodora [FEBRUARY 
of a single cell, which may be twice as broad at the top as below; usu- 
ally all but one of these branches are short and simple or nearly so; 
one being longer, and developing in the typical way. However 
many branches may issue from one cell, they are never whorled, but 
expand flabellately in one plane. In the writer's herbarium are 
specimens from Monterey, collected by Prof. G. J. Pierce, and from 
San Pedro, collected by Miss S. P. Monks and by Dr. N. L. Gardner; 
the specimens from the last are in the best condition, and should be 
considered the type. 
C. Howei n. sp. Filamentis repentibus vel decumbentibus, caes- 
ites densos formantibus; cellulis irregularibus, circa 150 5 diam., 
in cellula. terminali ad 75 у attenuatis; longitudine diametron 
aequante vel triplo superante; filamentis erectis, basi circa 50 x 
diam., ad 20-25 н diam. in apice rotundato vel subacuto attenuatis, e 
filamentis basilaribus exeuntibus, cellulis basi diametro 5-6-plo 
prope apicem ad 15-20-plo longioribus; filamentis erectis parce ramo- 
sis, ramis erectis vel adpressis, filamentis erectis similibus. 
Filaments creeping or decumbent, forming dense tufts; cells irregu- 
lar, about 150 » diam., diminishing to 75 x in the terminal cell, one to 
three diam. long; vertical filaments, about 50 и diam. at the base, 
diminishing to 20-25 и at the rounded or slightly acute apex, issuing 
from the basal filaments; cells 5-6 diam. long at the base, 15-20 at 
the tip; vertical filaments sparingly branched, branches erect or 
appressed, similar to the vertical filaments.—Gibbet Island, Bermuda, 
June, 1900, collected by Dr. M. A. Howe, No. 33. Type material 
in the herbarium of the writer and that of the New York Botanical 
Garden. 
Forming a dense coating in tide pools, about 1 em. high; the base 
a dense mass of dark green, much branched, irregular filaments, from 
which arise the slender, slightly branched, long-jointed filaments, 
pale green under the microscope, yellow in the mass. ‘This yellow 
may not be a permanent character, as the same shade appears to be 
produced by local conditions in some algae normally green. 'Тһе 
contorted, densely matted basal filaments suggest the subgenus Aeg- 
agropila, but there is no indication of a definite form to the whole mass. 
The sharp distinction between the delicate, erect filaments and the 
stout, thick-walled basal growth, reminds one of certain fresh water 
species of Cladophora, in which cells, often remaining connected in 
filaments, pass the winter in a thick-walled, akinete state, emitting new 
and quite different appearing filaments in the spring. But in C. Hower 
the stouter cells do not seem like akinetes, and appear to continue to 
